Thomas Gleixner 08ded2cd18 x86/fpu: Get rid of the FNSAVE optimization ... The FNSAVE support requires conditionals in quite some call paths because FNSAVE reinitializes the FPU hardware. If the save has to preserve the FPU register state then the caller has to conditionally restore it from memory when FNSAVE is in use. This also requires a conditional in context switch because the restore avoidance optimization cannot work with FNSAVE. As this only affects 20+ years old CPUs there is really no reason to keep this optimization effective for FNSAVE. It's about time to not optimize for antiques anymore. Just unconditionally FRSTOR the save content to the registers and clean up the conditionals all over the place. Suggested-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210623121454.617369268@linutronix.de		2021-06-23 18:29:41 +02:00
..
bugs.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
core.c	x86/fpu: Get rid of the FNSAVE optimization	2021-06-23 18:29:41 +02:00
init.c	x86/fpu: Get rid of fpu__get_supported_xfeatures_mask()	2021-06-23 17:49:46 +02:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
regset.c	x86/fpu: Rename xstate copy functions which are related to UABI	2021-06-23 18:23:14 +02:00
signal.c	x86/fpu: Rename xstate copy functions which are related to UABI	2021-06-23 18:23:14 +02:00
xstate.c	x86/fpu: Deduplicate copy_uabi_from_user/kernel_to_xstate()	2021-06-23 18:26:00 +02:00